mental dental

My lower permanent retainer snapped off the back of my teeth today, wire and all! I've been trying to pick the remaining glue off the back with some success, but most disturbing of all it looks like I developed some cavities underneath! What the heck?! I thought this thing was supposed to make my teeth better! I've never gotten a cavity in my life, even when I had a full grill of braces all over my mouth and with 3 extra wisdom teeth sitting in the back! Damn thing was a retainer alright... of LIES!!